Ah, my mistake. I know that you can build ARM binaries with Go, you ought to be able to invoke those from the NDK.
/r/golang had a link to this a while back, re: Go on iOS: https://groups.google.com/group/golang-dev/browse_thread/thr...
Looks like the iOS port requires a bit of work on cgo support for arm/linux before a proper iOS app can be made. Without the cgo shim it seems the app can't run more than 10 seconds, though the benchmarks are quite good.